Consider the ramifications if the Ukraine had indeed shot down Pres. Putin? This would have triggered a full on immediate invasion of Ukraine by Russian forces. I just don't see that as a valid strategy of the Ukrainian gov. Also even though the two jets looked remarkably similar in finish details any pilot can identify a 777 from miles away without seeing the detailed paint colors,
There may well have been fighter/bombers in the area considering the campaign
and the blast patterns are puzzling for sure, but I don't believe the fighter jet shoot down theory has much credence.